Hydrauolically power operated downhole tool, namely, a rotating control device that is hydraulically energized when drilling onshore oil and gas wells to create a pressure-tight barrier defense, namely, a clamp, in the wellbore annulus to contain and divert returning fluids

'annulus':36 'barrier':28 'clamp':32 'contain':38 'control':9 'creat':23 'defens':29 'devic':10 'divert':40 'downhol':4 'drill':16 'energ':14 'fluid':42 'gas':20 'hydraul':13 'hydrauol':1 'name':6,30 'oil':18 'onshor':17 'oper':3 'power':2 'pressur':26 'pressure-tight':25 'return':41 'rotat':8 'tight':27 'tool':5 'well':21 'wellbor':35

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